MarathonOS: For All Runners
Train. Plan. Race. Remember.
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Now you can view all training runs for an upcoming or finished race in one place, along with an improved onboarding experience — so you can start preparing even sooner!
YOUR MARATHON COMMAND CENTER
From registration to finish line to years of racing memories.
MarathonOS is the only app built for the full marathon (and any race really) experience. It's not a training app or a run tracker. It's the home for your entire racing life.
RACE DAY COMMAND CENTER: Countdown to race day. Upcoming race details, recent activity, weekly stats -- all on one dashboard. Open the app and know exactly where you stand.
RACE DAY LOGISTICS: Flights, hotels, parking, bib pickup, start line directions -- everything in one place. No more digging through emails the night before. Never show up unprepared again.
SMART CHECKLISTS: Gear, nutrition, travel, mental prep. Customizable lists with due dates so nothing gets left behind. Never forget your race belt again.
YOUR MARATHON MEMORY: Pre-race notes. Post-race reflections with mood, effort, and weather. Mile splits. What worked, what didn't. Build your personal marathon knowledge base that grows with every race you run.
PROVEN TRAINING PLANS: Four battle-tested methodologies built in -- Fatigue First and Build Then Sharpen. Link plans directly to your race with calendar sync.
TRAINING ANALYTICS: Race predictions, readiness score, heart rate zone analysis, training load tracking, workout grades, split consistency grading, and an activity heatmap -- all in a swipeable analytics carousel.
CONNECT YOUR WEARABLES: Strava, Garmin, and Apple Health. More options to come. Auto-import your runs. New activities sync within minutes.
Built for the long run. Free to use. Premium unlocks advanced plans, full analytics, unlimited checklists, and complete race logistics for the price of 2 gels or $5.99/month or $39.99/year.
Terms of Use: https://www.42cal.com/terms
- Granular race result splits, race route, and other stats viewable on the races tab
- See all runs corresponding to a training block in one place, summary view and individual runs
- Actual race result automatically replaces race data for a newly completed race
- Improved onboarding to get going faster
- Faster and improved Strava and Garmin activity syncing
- And minor bugs caught
The developer, Esteban De la Vega, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Health & Fitness
- Purchases
- Contact Info
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Esteban De la Vega
- Size
- 33 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Race Block Pass $24.99
- Premium Annual $39.99
- Premium Monthly $5.99
- Copyright
- © 2026 Esteban de la Vega